(THIO) Carbamoyl-Cyclohexane Derivatives as D3/D2 Receptor Antagonists

ABSTRACT

The present invention relates to new D3 and D2 dopamine receptor subtype preferring ligands of formula (I): 
     
       
         
         
             
             
         
       
     
     wherein R 1  and R 2  represent independently a substituent selected from hydrogen, alkyl, aryl, cycloalkyl, aroyl, or R 1  and R 2  may form a heterocyclic ring with the adjacent nitrogen atom; X represents an oxygen or sulphur atom; n is an integer of from 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof, to the processes for producing the same, to pharmaceutical compositions containing the same and to their use in therapy and/or prevention of a condition which requires modulation of dopamine receptors.

This application is a continuation-in-part of International Application No. PCT/HU2004/000056, filed May 21, 2004, which was published in English as International Publication No. WO 2005/012266 and claims the benefit of Hungarian Patent Application No. P0302451, filed Aug. 4, 2003, both of which are hereby incorporated by reference.

FIELD OF THE INVENTION

The present invention relates to new D₃ and D₂ dopamine receptor subtype preferring ligands of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof, to the processes for producing the same, to pharmacological compositions containing the same and to their use in therapy and/or prevention of a condition which requires modulation of dopamine receptors.

DESCRIPTION OF THE PRIOR ART

Cyclohexane derivatives are described in patent application WO 99/67206 useful in the therapy for the treatment of pain.

The compounds mentioned in the above publications are not declared or even not suggested having activity on the dopamine D₃ and/or D₂ receptors.

SUMMARY OF THE INVENTION

Surprisingly it was found that in contrast to the known above mentioned structurally analogous compounds the new derivatives of formula (I) of the present invention have high or very high affinity for dopamine D₃ receptors and moderate to high affinity to dopamine D₂ receptors always in such a combination that the D₃ affinity is 5 to 200 fold higher than the D₂ affinity. In addition, the compounds have even higher selectivity over other receptors, such as alpha-1 receptors. The dual (i.e. D₃ and D₂) receptor functional antagonism coupled in the above mentioned particular proportion is especially important as it allows the simultaneous manifestation of the beneficial effects of modulation of both the D₃ and D₂ receptors, however, without the appearance of the known disadvantages of each individual receptor action.

This type of new molecules belonging to the structure of formula (I) will be referred further on in this application as “D₃/D₂ ligands with D₃ preference”.

The invention relates to new cyclohexane derivatives having (thio)carbamoyl side chain of formula (I):

wherein

R₁ and R₂ represent independently a substituent selected from hydrogen, alkyl, aryl, alkenyl, cycloalkyl, aroyl, or R₁ and R₂ may form a heterocyclic ring with the adjacent nitrogen atom;

X represents an oxygen or sulphur atom;

n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof, to the processes for producing the same, to pharmacological compositions containing the same and to their use in therapy and/or prevention of pathological conditions which require the modulation of dopamine receptors such as psychoses (e.g. schizophrenia, schizo-affective disorders, etc.), drug (e.g. alcohol, cocaine and nicotine, opioids, etc.) abuse, cognitive impairment accompanying schizophrenia, mild-to-moderate cognitive deficits, dementia, psychotic states associated with dementia, eating disorders (e.g. bulimia nervosa, etc.), attention deficit disorders, hyperactivity disorders in children, psychotic depression, mania, paranoid and delusional disorders, dyskinetic disorders (e.g. Parkinson's disease, neuroleptic induced parkinsonism, tardive dyskinesias) anxiety, sexual dysfunction, sleep disorders, emesis, aggression, autism.

DETAILED DESCRIPTION OF THE INVENTION

The invention relates to new cyclohexane derivatives having (thio)carbamoyl side chain of formula (I):

wherein

R₁ and R₂ represent independently a substituent selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl, aroyl, or R₁ and R₂ may form a heterocyclic ring with the adjacent nitrogen atom;

X represents an oxygen or sulphur atom;

n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.

When R₁ and/or R₂ represent alkyl, the alkyl moiety may contain 1 to 6 carbon atoms with straight or branched chain optionally substituted with one or more C₁₋₆ alkoxycarbonyl, aryl, preferably phenyl or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group.

R₁ and R₂ may form a heterocyclic ring with the adjacent nitrogen atom, which may be saturated or unsaturated optionally substituted monocyclic or bicyclic ring, which may contain further heteroatoms selected from O, N, or S. The heterocyclic ring is preferably pyrrolidine, piperazine, piperidine or morpholine ring.

When R₁ and/or R₂ represent alkenyl, the alkenyl moiety may have 2 to 7 carbon atoms and 1 to 3 double bonds.

When R₁ and/or R₂ represent aryl, the aryl moiety may be selected from an optionally substituted mono-, bi- or tricyclic aryl, such as phenyl, naphthyl, fluorenonyl, or antraquinonyl group, preferably phenyl or naphthyl. The aryl moiety may be substituted with one or more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano. The aryl is as defined above.

When R₁ and/or R₂ represent cycloalkyl, the cycloalkyl moiety may be selected from an optionally substituted mono-, bi- or tricyclic cycloalkyl group, such as cyclohexyl or adamantyl.

When R₁ and/or R₂ represent aroyl the aryl moiety therein is as defined above, preferably phenyl.

The invention relates also to the salts of compounds of formula (I) formed with acids.

Both organic and inorganic acids can be used for the formation of acid addition salts. Suitable inorganic acids can be for example hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid. Representatives of monovalent organic acids can be for example formic acid, acetic acid, propionic acid, and different butyric acids, valeric acids and capric acids. Representatives of bivalent organic acids can be for example oxalic acid, malonic acid, maleic acid, fumaric acid and succinic acid. Other organic acids can also be used, such as hydroxy acids for example citric acid, tartaric acid, or aromatic carboxylic acids for example benzoic acid or salicylic acid, as well as aliphatic and aromatic sulfonic acids for example methanesulfonic acid, naphtalenesulfonic acid and p-toluenesulfonic acid. Especially valuable group of the acid addition salts is in which the acid component itself is physiologically acceptable and does not have therapeutical effect in the applied dose or it does not have unfavourable influence on the effect of the active ingredient. These acid addition salts are pharmaceutically acceptable acid addition salts. The reason why acid addition salts, which do not belong to the pharmaceutically acceptable acid addition salts belong to the present invention is, that in given case they can be advantageous in the purification and isolation of the desired compounds.

Solvates and/or hydrates of compounds of formula (I) are also included within the scope of the invention.

The compounds of formula (I) exist in the form of cis and trans isomers with respect to the configuration of the cyclohexane ring. These and their mixtures are likewise within the scope of the present invention. The compounds of the invention are preferably in trans configuration.

Certain compounds of formula (I) when the compound contains C₂₋₇ alkenyl group can exist in the form of cis- and/or trans-isomers. These are likewise within the scope of the present invention including all such isomers and the mixtures thereof.

Certain compounds of formula (I) can exist as stereoisomers and diastereomers, too. These and the mixtures thereof are likewise within the scope of the present invention.

As the invention relates also to the salts of compounds of formula (I) formed with acids, especially the salts formed with pharmaceutically acceptable acids, the meaning of compound of formula (I) is either the free base or the salt even if it is not referred separately.

Preferred compounds of the invention are those compounds of formula (I), wherein

-   -   R₁ and R₂ represent independently hydrogen, or         -   C₁₋₆ alkyl, with straight or branched chain optionally             substituted with one or more C₁₋₆ alkoxycarbonyl, aryl, or             (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group, or R₁ and R₂ may             form a heterocyclic ring with the adjacent nitrogen atom,             which may be saturated or unsaturated optionally substituted             monocyclic or bicyclic ring, which may contain further             heteroatoms selected from O, N, or S, or         -   C₂₋₇ alkenyl with 1 to 3 double bond, or         -   a mono-, bi- or tricyclic aryl optionally substituted with             one or more C₁₋₆ alkoxy, trifluoro C₁₋₆ alkoxy, C₁₋₆             alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen             or cyano, or         -   an optionally substituted mono-, bi- or tricyclic cycloalkyl             group, or aroyl group;

X represents oxygen or sulphur atom;

n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.

Particularly preferred compounds of the invention are those compounds of formula (I), wherein

-   -   R₁ and R₂ represent independently hydrogen, or         -   C₁₋₆ alkyl, with straight or branched chain and optionally             substituted with one or more C₁₋₆ alkoxycarbonyl, phenyl or             (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group or R₁ and R₂ may form             a heterocyclic ring with the adjacent nitrogen atom, which             may be saturated optionally by C₁₋₆ alkyl or hydroxy             substituted monocyclic ring, which may contain further             heteroatoms selected from O or N, or         -   C₂₋₇ alkenyl with 1 double bond, or         -   phenyl or naphthyl group optionally substituted with one or             more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆             alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen             or cyano, or         -   cyclohexyl or adamantyl group, or         -   benzoyl group;

X represents oxygen or sulphur atom;

n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.

The most prominent compounds of the invention are those compounds of formula (I), wherein

-   -   R₁ and R₂ represent independently hydrogen, or         -   C₁₋₆ alkyl with straight or branched chain optionally             substituted with C₁₋₆ alkoxycarbonyl, or phenyl or R₁ and R₂             form with the adjacent nitrogen atom an optionally by C₁₋₆             alkyl or hydroxy substituted pyrrolidine, piperazine,             piperidine or morpholine ring;         -   allyl;         -   phenyl optionally substituted with one or more C₁₋₆ alkoxy,             cyano or C₁₋₆ alkanoyl;         -   cyclohexyl;

X represents oxygen or sulphur;

n is 1, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts to and/or hydrates and/or solvates thereof.

The invention also relates to the pharmaceutical compositions containing the compounds of formula (I) as active ingredient.

Further subject of the present invention is the pharmaceutical manufacture of medicaments containing compounds of formula (I), as well as the process of treatments and/or prevention with these compounds, which means administering to a mammal to be treated—including human—effective amount/amounts of compounds of formula (I) of the present invention as such or as medicament.

The present invention also provides a process (Method A) for preparing compounds of formula (I) by forming an amide bond between a (thio)carbamoylchloride of formula (II)):

wherein R₁, R₂ and X is as described above for the formula (I);

and an amine of formula (III):

wherein the meaning of n is as described above for the formula (I), or derivatives thereof.

The amide bond formation may be carried out by known methods, preferably by suspending or dissolving the appropriate amine (III) or a salt thereof in a suitable solvent (e.g. tetrahydrofurane, dimethylformamide or chlorinated hydrocarbons or hydrocarbons) and reacting it with the appropriate (thio)carbamoylchloride (II) in the presence of a base (e.g. triethylamine). The reaction can be carried out advantageously between −10° C. and 60° C. The reactions are followed by thin layer chromatography. The necessary reaction time is about 6-60 h. The work-up of the reaction mixture can be carried out by known methods. The products can be purified, e.g. by crystallization or by column chromatography.

Another process (Method B) for preparing the compounds of formula (I) by forming an amide bond between the iso(thio)cyanate of formula (IV):

R₁—N═C═X  (IV)

wherein the meaning of R₁ and X is as described above for the formula (I), and an amine of formula (III):

wherein the meaning of n is as described above for the formula (I), or derivatives thereof.

The amide bond formation may be carried out by known methods, preferably by suspending or dissolving the appropriate amine (III) or a salt thereof in a suitable solvent (e.g. tetrahydrofurane, dimethylformamide or chlorinated hydrocarbons or hydrocarbons) and reacting it with the appropriate iso(thio)cyanates (IV) if necessary in the presence of a base (e.g. triethylamine). The reaction can be carried out advantageously between 5° C. and 50° C. The reactions are followed by thin layer chromatography. The necessary reaction time is about 6-10 h. The work-up of the reaction mixture can be carried out by known methods. The products can be purified, e.g. by crystallization or by column chromatography.

Method B may be carried out also by using automated parallel synthesis.

Another process (Method C) for preparing compounds of formula (I) is transforming in situ an amine of formula (III) to iso(thio)cyanate derivative and reacting the latter with an amine of formula (V):

wherein R₁ and R₂ are as described above for the formula (I), or derivatives thereof.

The above reaction may be carried out by known methods. The transformation of amine (III) to iso(thio)cyanate derivative may be carried out in situ in an aprotic solvent (e.g. tetrahydrofurane, chlorinated hydrocarbons) by the use of an appropriate (thio)carbonic acid derivative (e.g. phosgene, triphosgene, thiophosgene) in the presence of a base (e.g. triethylamine), advantageously between −5° C. and room temperature. To the thus obtained solution or suspension an appropriate amine of formula (V), wherein R₁ and R₂ are as described above, is added in the form of base or salt formed with organic or inorganic acid. The necessary reaction time is between 2-24 hours. The work-up of the reaction mixture can be carried out by known methods. The products can be purified, e.g. by crystallization or by column chromatography.

The obtained (thio)ureas of formula (I) can be transformed into the salts thereof with acids and/or liberated the (thio)ureas of formula (I) from the obtained acid addition salts by treatment with a base, and/or the cis- and/or trans-isomers and/or the stereoisomers and/or diastereomers can be separated and/or can be transformed into hydrates and/or solvates thereof.

The (thio)carbamoylchlorides of formula (II) and iso(thio)cyanates of formula (IV) and the amines of formula (V), wherein R₁, R₂ and X are as defined above, are either commercially available or can be synthesized by different known methods.

The synthesis of amine of formula (III), wherein n=1 is described e.g. in WO 03/029233 or in Bioorg. Med. Chem. Lett.; EN; 7; 18; 1997; 2403-2408.

The amines of formula (III), wherein n=2, are new compounds and are also included within the scope of the present invention.

The new amines of formula (III), wherein n=2 are synthesized by conventional known methods mentioned above.

The compounds of formula (I) can also be prepared by automated parallel synthesis.

The separation of cis- and trans isomers either of compounds of formula (I) or of formula (III) or the protected derivatives of the latter is carried out by conventional methods, e.g. by chromatography and/or crystallization, or the cis and trans isomers of formula (I) can be prepared from the pure cis or trans precursor.

The compounds of formula (I) of the present invention, in contrast to known antipsychotics, have been found to exhibit high affinity for dopamine D₃ receptors, less activity toward D₂ receptors and much less affinity to aderenergic alpha-1 receptors, and are expected to be useful in the treatment of disease states and/or prevention the same in which dopamine D₃ and/or D₂ receptors are involved in the disease pathology and thus their modulation is required.

Dysfunction of the dopaminergic neurotransmitter system is involved in the pathology of several neuropsychiatric and neurodegenerative disorders, such as schizophrenia, drug abuse and Parkinson's disease, respectively. The effect of dopamine is mediated via at least five distinct dopamine receptors belonging to the D₁-(D₁, D₅) or the D₂-(D₂, D₃, D₄) families. D₃ receptors have been shown to have characteristic distribution in the cerebral dopaminergic systems. Namely, high densities were found in certain limbic structures, such as nucleus accumbens and islands of Calleja. Therefore, preferential targeting of the D₃ receptors may be a promising approach for more selective modulation of dopaminergic functions and consequently for successful therapeutic intervention in several abnormalities, such as schizophrenia, emotional or cognitive dysfunctions and addiction (Sokoloff, P. et al.: Nature, 1990, 347, 146; Schwartz, J. C. et al.: Clin. Neuropharmacol. 1993, 16, 295; Levant, B.: Pharmacol. Rev. 1997, 49, 231), addiction (Pilla, C. et al.: Nature 1999, 400, 371) and Parkinson's disease (Levant, B. et al.: CNS Drugs 1999, 12, 391) or pain (Levant, B. et al.: Neurosci. Lett. 2001, 303, 9).

The dopamine D₂ receptors are widely distributed in the brain and are known to be involved in numerous physiological functions and pathological states. D₂ antagonists are widely used drugs as antipsychotics, for example. However, it is also well known that massive antagonism of the D₂ receptors leads to unwanted side-effects such as extrapyramidal motor symptoms, psychomotor sedation or cognitive disturbances. These side effects seriously restrict the therapeutic utilization of D₂ antagonist compounds. (Wong A. H. C. et al.: Neurosci. Biobehay. Rev. 2003, 27, 269.).

The present invention provides novel compounds of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof which have high (less than 10 nM) or very high (less than 1 nM) affinity to dopamine D₃ receptors and—simultaneously—have moderate (between 50 and 200 nM) to high (between 1 and 10 nM) affinity to D₂ receptors always in such combination that the D₃ affinity is 5 to 200 fold higher than the D₂ affinity.

In a further aspect of the present invention it provides a method of treating conditions which require preferential modulation of dopamine D₃ and/or D₂ receptors, for example psychoses (e.g. schizophrenia, schizo-affective disorders), cognitive impairment accompanying schizophrenia, mild-to-moderate cognitive deficits, dementia, psychotic states associated with dementia, psychotic depression, mania, paranoid and delusional disorders, dyskinetic disorders such as Parkinson's disease, neuroleptic induced parkinsonism, tardive dyskinesia, eating disorders (e.g. bulimia nervosa), attention deficit disorders, hyperactivity disorders in children, depression, anxiety, sexual dysfunction, sleep disorders, emesis, aggression, autism and drug abuse, which comprises administering to a subject in need thereof an effective amount of a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.

The invention also provides the use of a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof in the manufacture of a medicament for the treatment of conditions which require modulation of dopamine receptors especially that of dopamine D₃ and/or D₂ receptors.

A preferred use for D₃/D₂ antagonists with D₃ preference according to the present invention is in the treatment of schizophrenia, schizo-affective disorders, cognitive impairment accompanying schizophrenia, mild-to-moderate cognitive deficits, dementia, psychotic states associated with dementia, psychotic depression, mania, paranoid and delusional disorders, dyskinetic disorders such as Parkinson's disease, neuroleptic induced parkinsonism, depression, anxiety, drug abuse (e.g. cocaine abuse).

The particular combination of the two receptor-actions described above allows the simultaneous manifestation of the beneficial actions of both the D₃ antagonism (e.g. cognitive enhancer effect, inhibition of extrapyramidal motor symptoms, inhibitory action on drug abuse) and the D₂ antagonism (e.g. antipsychotic effect). Furthermore, the same combination surprisingly results in cancelling out the disadvantageous features of D₂ antagonism (e.g. extrapyramidal symptoms, psychomotor sedation, cognitive disturbances).

For use in medicine, the compounds of formula (I) of the present invention and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof are usually administered as a standard pharmaceutical composition. The present invention therefore provides in a further aspect pharmaceutical compositions comprising a new compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof and physiologically acceptable carriers.

The compounds of formula (I) of the present invention and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof may be administered by any convenient method, for example by oral, parental, buccal, sublingual, nasal, rectal or transdermal administration and the pharmaceutical compositions adapted accordingly.

The compounds of formula (I) of the present invention and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof which are active when given orally can be formulated as liquids or solids, for example syrups, suspensions or emulsions, tablets, capsules and lozenges.

A liquid formulation of the compounds of formula (I) of the present invention and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof generally consists of a suspension or solution of the compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof in a suitable liquid carrier(s) for example an aqueous solvent, such as water, ethanol or glycerine, or a non-aqueous solvent, such as polyethylene glycol or an oil. The formulation may also contain a suspending agent, preservative, flavouring or colouring agent.

A composition in the solid form of a tablet can be prepared using any suitable pharmaceutical carrier(s) routinely used for preparing solid formulations. Examples of such carriers include magnesium stearate, starch, lactose, sucrose, cellulose etc.

A composition in the solid form of a capsule can be prepared using routine encapsulation procedures. For example, pellets containing the active ingredient can be prepared using standard carriers and then filled into a hard gelatine capsule; alternatively, a dispersion or suspension can be prepared using any suitable pharmaceutical carrier(s), for example aqueous gums, celluloses, silicates or oils and the dispersion or suspension then filled into a soft gelatine capsule.

Typical parenteral compositions consist of a solution or suspension of the compound of formula (I) of the present invention and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof in a steril aqueous carrier or parenterally acceptable oil, for example polyethylene glycol, polyvinyl pyrrolidone, lecithin, arachis oil or sesame oil. Alternatively, the solution can be lyophilised and then reconstituted with a suitable solvent just prior to administration.

Compositions of the present invention for nasal administration containing a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof may conveniently be formulated as aerosols, drops, gels and powders. Aerosol formulations of the present invention typically comprise a solution or fine suspension of the compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof in a physiologically acceptable aqueous or non-aqueous solvent and are usually presented in a single or multidose quantities in steril is form is a sealed container, which can take the form of a cartridge or refill for use with an atomising device. Alternatively, the sealed container may be a unitary dispensing device, such as a single dose nasal inhaler or an aerosol dispenser fitted with a metering valve which is intended for disposal once the contents of the container have been exhausted. Where the dosage form comprises an aerosol dispenser, it will contain a propellant which can be a compressed gas, such as compressed air or an organic propellant, such as a fluorochlorohydrocarbon. The aerosol dosages form can also take the form of a pump-atomiser. Compositions of the present invention containing a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof suitable for buccal or sublingual administration include tablets, lozenges and pastilles, wherein the active ingredient is formulated with a carrier, such as sugar and acacia, tragacanth, or gelatine and glycerin etc.

Compositions of the present invention containing a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof for rectal administration are conveniently in the form of suppositories containing a conventional suppository base, such as cocoa butter.

Compositions of the present invention containing a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof for transdermal administration include ointments, gels and patches.

The compositions of the present invention containing a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof are preferably in the unit dose form, such as tablet, capsule or ampoule.

Each dosage unit of the present invention for oral administration contains preferably from 1 to 250 mg of a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof calculated as a free base.

Each dosage unit of the present invention for parenteral administration contains preferably from 0.1 to 2 mg of a compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof calculated as a free base.

The physiologically acceptable compounds formula (I) of the present invention and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof can normally be administered in a daily dosage regimen (for an adult patient) of, for example, an oral dose between 1 mg and 500 mg, preferably between 10 mg and 400 mg, e.g. between 10 mg and 250 mg or an intravenous, subcutaneous, or intramuscular dose of between 0.1 mg and 100 mg, preferably between 0.1 mg and 50 mg, e.g. between 1 and 25 mg of the compound of formula (I) and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof calculated as the free base. The compounds of the present invention can be administered 1 to 4 times per day. The compounds of the present invention can suitably be administered for a period of continuous therapy, for example for a week or more.

Biological Test Methods

Receptor Binding Assays

1. D₃ Receptor Binding

Binding assays were carried out on rat recombinant D₃ receptors (expressed in Sf9 cells) according to the supplier instruction (Packard BioScience, BioSignal Packard Inc. Cat. No. 6110139, Technical Data Sheet) using [³H]-spiperone (0.85 nM) as ligand and haloperidol (10 μM) for determination of non-specific binding.

2. D₂ Receptor Binding

D₂ receptor binding assay was carried out as described by Creese et al. (European Journal of Pharmacology 60:55-66, 1979) on rat brain striatal membrane preparation using [³H]-spiperone (0.6 nM) as ligand. The non-specific binding was determined in the presence of 1 μM (+)-butaclamol.

3. Alpha-1 Receptor Binding

Alpha-1 receptor binding study was performed according to the method described by Greengrass and Bremmer (European Journal of Pharmacology 55:323-326, 1979) on rat brain cortical membrane preparation using [³H]-prasosin (0.5 nM) as ligand. The non-specific binding was determined in the presence of 10 μM phentolamine.

D₃ and D₂ and alpha-1 receptor binding data of selected compounds of the invention are listed in the Table hereinbelow.

D3 D2 Alfa-1 Compound IC-50 (nM) IC-50 (nM) IC-50 (nM)  1 +++ ++ >200  2 ++++ ++ >200  4 ++++ ++ >200  5 ++++ ++ >200  6 ++++ ++ >200  7 +++ ++ >200  8 ++++ ++ >200  9 ++++ +++ >200 16 ++++ ++ >200 21 ++++ ++ >200 24 ++++ ++ >200 29 +++ ++ >200 31 ++++ ++ >200 32 ++++ ++ >200 33 ++++ ++ >200 38 +++ ++ >200 42 ++++ ++ >200 44 ++++ ++ >200 45 ++++ ++ >200 47 ++++ ++ >200 48 ++++ ++ >200 49 ++++ + >200 50 ++++ + >200 51 ++++ ++ >200 Haloperidol + ++ ++ Aripiprazole +++ ++ >200 Risperidone ++ ++ +++ Olanzapine + + ++ +: IC-50 is between 50 and 200 nM ++: IC-50 is between 10 and 50 nM +++: IC-50 is between 1 and 10 nM ++++: IC-50 is less than 1 nM >200: IC-50 value is higher than 200 nM

The most prominent side effects of the first generation antipsychotic compounds (e.g. chlorpromazine and haloperidol) are the extrapyramidal symptoms such as pseudoparkinsonism and tardive dyskinesia and the orthostatic hypotension. The former two are the result of massive blockade of D₂ receptors in the basal ganglia whereas the latter is the consequence of antagonism of alpha-1 receptors.

Compounds in the above Table are highly or very highly potent ligands at D₃ receptors (IC-50 values are less than 1 nM or between 1 and 10 nM, respectively) and moderately to highly potent ligands at dopamine D₂ receptors showing 5 to 200 fold selectivity (selectivity: IC-50 for D₂ divided by IC-50 for D₃) over D₂ receptors. However, coupling the high or very high D₃ affinity to the moderate to high D₂ affinity in this particular proportion allows to preserve the beneficial (e.g. antipsychotic) actions of a D₂ antagonist while—at the same time—impedes (by the D₃ antagonism) the appearance of the disadvantageous consequences of massive D₂ receptor blockade like extrapyramidal symptoms or cognitive disturbances. It is therefore anticipated that no or greatly diminished adverse effects related to D₂ receptors will occur in the course of therapeutical application of compounds of the present invention. In addition, the compounds have very low or practically no affinity to adrenergic alpha-1 receptors (IC-50 higher than 200 nM for each compound) and thus have extremely high D₃/alpha-1 selectivity (ranging from several hundred-fold to several thousand fold). From the very low or no affinity of the compounds to adrenergic alpha-1 receptors the lack of cardiovascular side effects (e.g. orthostatic hypotension) is anticipated.

The invention is further illustrated by the following non-limiting examples.

The structure of all intermediates and end products were elucidated by IR, NMR and MS spectroscopy.

Example 1 1-(2,3-dichlorophenyl)-[1,4]diazepine Starting Material

2.25 g (10 mmol) 1-bromo-2,3-dichloro-benzene was dissolved in dry toluene (50 ml), 2.3 (11 mmol) of [1,4]diazepine-1-carboxylic acid tert-butylester was added followed by 0.2 g BINAP (2,2-bis(diphenylphosphino)-1,1′-binaphtyl), 85 mg tris(dibenzylideneacetone)dipalladium(0) and 1.2 g (12 mmol) sodium-tert-butoxyde. The reaction mixture was refluxed for eight hours and filtered. The organic layer was to washed with water, dried and evaporated in vacuo. The residue was purified by chromatography and deprotected at 10° C. using 20 ml ethylacetate saturated with gaseous hydrochloric acid, the precipitate was filtered giving 2.1 g (yield: 75%) hydrochloride salt of the title compound, melting at 182-3° C.

Example 2 Trans-N-{4-[2-[4-(2,3-dichloro-phenyl)-hexahydro-[1,4]diazepin-1-yl]-ethyl]-cyclohexyl}-carbamic Acid Tert-Butylester Intermediate

0.7 g (2.5 mmol) of 1-(2,3-dichlorophenyl)-[1,4]diazepine hydrochloride and 0.6 g (2.5 mmol) of trans-2-{1-[4-(N-tert-butyloxycarbonyl)amino]cyclohexyl}-acetaldehyde were dissolved in dichloroethane (35 ml), 0.35 ml (2.5 mmol) triethylamine was added, then 0.79 g (3.7 mmol) sodium triacetoxyborohydride was added portionswise and the reaction mixture was stirred for 20 hours at ambient temperature, then 20% potassium carbonate solution in water (20 ml) was added. The organic layer was separated, dried and evaporated to dryness in vacuo. The precipitate was recrystallized from acetonitrile to give the title compound 1.0 g (yield: 85.8%), m.p.: 95-8° C.

Example 3 Trans-4-[2-[4-(2,3-dichloro-phenyl)-hexahydro-[1,4]diazepin-1-yl]-ethyl]-cyclohexylamine Intermediate

0.93 g (2.1 mmol) trans-N-{-4-[2-[4-(2,3-dichloro-phenyl)-hexahydro-[1,4]diazepin-1-yl]ethyl]-cyclohexyl}-carbamic acid tert-butylester was deprotected at 10° C. using 15 ml ethylacetate saturated with gaseous hydrochloric acid, after 4 hours the precipitate was filtered giving 0.91 g (yield: 98%) dihydrochloride salt of the title compound, melting at 260-6° C.

Method A Trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3,3-dimethyl-urea Compound 1

1.39 g (3 mmol) trans-4-{2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]ethyl}-cyclohexyl-amine trihydrochloride was suspended in dichloromethane (100 ml), triethylamine (2.1 ml, 15 mmol) was added followed by 0.30 ml (3.3 mmol) N,N-dimethylcarbamoylchloride. The reaction mixture was stirred for 48 hours at room temperature, filtered. The filtrate was washed with water (2×20 ml), dried and evaporated in vacuo. Recrystallizing from methanol gave the title compound (0.83 g, 65%), melting at 212-4° C.

Method B Trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-ethyl-urea Compound 2

0.56 g (1.2 mmol) trans-4-{2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]ethyl}-cyclohexyl-amine was dissolved in dry dichloromethane (20 ml), ethylisocyanate (0.1 ml, 1.3 mmol) was added and the reaction mixture was stirred at room temperature for 4 hours. The solvent was removed in vacuo. The residue was stirred with water, the precipitate was filtered, giving the title compound (0.33 g, 65%). Melting point: 235-8° C.

Method C Trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3,3-dimethyl-urea Compound 1

0.56 g (1.2 mmol) trans-4-{2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl}-cyclohexyl-amine trihydrochloride was suspended in dry dichloromethane (50 ml), triethylamine 0.77 ml, 6 mmol) was added and 0.13 g (0.44 mmol) triphosgene dissolved in dichloromethane was dropped in. After one hour stirring at room temperature dimetilamine hydrochloride (0.49 g, 6 mmol) followed by triethylamine (0.84 ml, 6 mmol) was added and the stirring was continued for 20 hours. The mixture was filtered, the filtrate washed with water, dried and evaporated in vacuo. Recrystallizing the product from methanol gave the title compound (0.27 g, 52%). Melting point: 212-4° C.

Applying one of the above procedures the following compounds were prepared:

-   trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]ethyl]-cyclohexyl}-3-methyl-urea     (compound 3), melting point: 210-4° C.; -   trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-propyl-urea     (compound 4), melting point: 218-20° C.; -   trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-isopropyl-urea     (compound 5), melting point: 227-30° C.; -   trans-1-{4-[2-[4-(2,3-dichlorophenyl)-hexahydro[1,4]diazepin-1-yl-]ethyl]-cyclohexyl}-3-ethyl-urea     (compound 6), melting point: 115-8° C.; -   trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-hexahydro[1,4]diazepin-1-yl]-ethyl]-cyclohexyl}-3,3-dimethyl-urea     (compound 7), melting point: 168-72° C.; -   trans-N-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-pyrrolidine-1-carboxamide     (compound 8), melting point: 201-3° C.; -   trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-hexahydro[1,4]diazepin-1-yl]-ethyl]-cyclohexyl}-pyrrolidine-1-carboxamide     (compound 9); -   trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3,3-diethyl-urea     (compound 10), melting point: 171-3° C.; -   trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-ethyl-3-methyl-urea     (compound 11), melting point: 195-8° C.; -   trans-1-{4-[2-[4-(2,3-dichlorophenylypiperazin-1-yl]-ethyl]-cyclohexyl}-3-methyl-3-propyl-urea     (compound 12), melting point: 137-9° C.; -   trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-urea     (compound 13), melting point: 215-7° C.; -   trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl-]ethyl]-cyclohexyl}-piperazine-1-carboxamide     (compound 14), melting point: 293-6° C.; -   trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-4-methyl-piperazine-1-carboxamide     (compound 15), melting point: 166-8° C.; -   trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-morpholine-4-carboxamide     (compound 16), melting point: 201-3° C.; -   trans-N-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-piperidine-1-carboxamide     (compound 17), melting point: 188-90° C.; -   trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-4-hydroxy-piperidine-1-carboxamide     (compound 18), melting point: 178-80° C.

Automated Parallel Synthesis (General Procedure)

0.1 mmol of trans-4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylamine was dissolved in 1 ml of dichloromethane, and 0.1 mmol of the appropriate isocyanate or isothiocyanate compound was added. The mixture was vigorously shaken for 12 hours. The solvent was evaporated in vacuo. 1 ml of n-hexane was added to the remaining solid and the mixture was vigorously shaken for 20 minutes. The solvent was decanted from the solid residue, and the solid was dried in vacuo.

Applying the above procedures the following compounds were prepared:

Purity (HPLC compound mol weight k′ Area %) Iupac 19 505.49 5,768 99.4 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2- methoxy-phenyl)-urea 20 505.49 5,807 95.59 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(3- methoxy-phenyl)-urea 21 439.43 4,816 96.25 trans-1-Allyl-3-(4-{2-[4-(2,3-dichloro- phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 22 535.52 5,901 99.52 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2,4- dimethoxy-phenyl)-urea 23 519.52 6,092 98.37 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2- ethoxy-phenyl)-urea 24 455.48 6,123 95.02 trans-1-Butyl-3-(4-{2-[4-(2,3-dichloro- phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 25 559.46 6,619 94.62 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4- trifluoromethoxy-phenyl)-urea 26 533.59 6,324 99.43 trans-1-Adamantan-1-yl-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 27 521.56 5,976 88.03 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4- methylsulfanyl-phenyl)-urea 28 551.56 6,441 85.42 trans-1-Biphenyl-2-yl-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 29 513.51 5,354 99.3 trans-2-[3-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-ureido]- 3-methyl-butyric acid methyl ester 30 533.50 6,161 96.32 trans-2-[3-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)- ureido]-benzoic acid methyl ester 31 500.48 5,704 93.41 trans-1-(3-Cyano-phenyl)-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 32 565.55 5,694 93.74 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}cyclohexyl)-3-(3,4,5- trimethoxy-phenyl)-urea 33 481.51 5,591 99 trans-1-Cyclohexyl-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 34 441.45 5,121 96.93 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3- propyl-urea 35 491.53 5,689 98.53 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3- phenyl-thiourea 36 549.65 6,852 95.94 trans-1-Adamantan-1-yl-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-thiourea 37 487.50 5,951 99 trans-1-(4-{2-[4-(2,3-dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3- ethoxycarbonyl-thiourea 38 471.54 5,634 97.03 trans-1-tert-Butyl-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-thiourea 39 505.56 5,909 99 trans-1-Benzyl-3-(4-{2-[4-(2,3-dichloro- phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-thiourea 40 521.56 5,77 94.24 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2- methoxy-phenyl)-thiourea 41 471.54 5,786 99 trans-1-Butyl-3-(4-{2-[4-(2,3-dichloro- phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-thiourea 42 457.51 5,387 96.79 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3- propyl-thiourea 43 519.54 6,459 97.68 trans-1-Benzoyl-3-(4-{2-[4-(2,3-dichloro- phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-thiourea 44 501.52 5,382 96.17 trans-[3-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)- thioureido]-acetic acid ethyl ester 45 443.49 5,007 99 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-ethyl- thiourea 46 541.59 6,401 96.26 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3- naphthalen-1-yl-thiourea 47 455.48 5,143 94.98 trans-1-tert-Butyl-3-(4-{2-[4-(2,3- dichloro-phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 48 475.47 5,481 95.69 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3- phenyl-urea 49 489.49 5,491 94.42 trans-1-Benzyl-3-(4-{2-[4-(2,3-dichloro- phenyl)-piperazin-1-yl]-ethyl}- cyclohexyl)-urea 50 505.49 5,666 90.78 trans-1-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4- methoxy-phenyl)-urea 51 485.46 4,754 97.78 trans-[3-(4-{2-[4-(2,3-Dichloro-phenyl)- piperazin-1-yl]-ethyl}-cyclohexyl)-ureido]- acetic acid ethyl ester

The LC/MS analysis were performed using an HP 1100 binary gradient system, controlled by ChemStation software. HP diode array detector was used to acquire UV spectra at λ=210 nm. Analytical chromatographic experiments were made on Discovery C₁₋₆-Amide, 5 cm×4.6 mm×5 μm column with a flow rate of 0.8 ml/min for qualification (purity, capacity factor). All experiments were performed using HP MSD single quadruple mass spectrometer equipped with an electrospray ionisation source to determine the molecular mass.

[k′=t _(R) −t ₀ /t ₀ t _(R)=retention time

-   -   t₀=eluent retention time]     -   k′=capacity factor

The A eluent was water containing 0.1% TFA (Sigma, Germany), the B eluent was 95% acetonitrile (Merck, Germany) containing 0.1% TFA and 5% A eluent. Gradient elution was used, starting with 100% A eluent and processing to 100% B eluent over a period of 15 minutes.

Pharmaceutical formulations a) Intravenous injection Compound of formula (I) 1-40 mg Buffer to pH ca 7 Solvent/complexing agent to 100 ml b) Bolus injenction Compound of formula (I) 1-40 mg Buffer to pH ca 7 Co-solvent to 5 ml Buffer: suitable buffers include citrate, phosphate, sodium hydroxide/hydrochloric acid. Solvent: typically water but may also include cyclodextrins (1-100 mg) and co-solvents, such as propylene glycol, polyethylene glycol and alcohol. c) Tablet Compound of formula (I) 1-40 mg Diluent/Filter(may also include cyclodextrins) 50-250 mg Binder 5-25 mg Disintegrant (may also include cyclodextrins) 5-50 mg Lubricant 1-5 mg Cyclodextrin 1-100 mg Diluent: e.g. mycrocrystalline cellulose, lactose starch. Binder: e.g. polyvinylpyrrolidone, hydroxypropylmethylcellulose. Disintegrant: e.g. sodium starch glycolate, crospovidone. Lubricant: e.g. magnesium stearate, sodium stearyl fumarate d) Oral suspension Compound of formula (I) 1-40 mg Suspending agent 0.1-10 mg Diluent 20-60 mg Preservative 0.01-1.0 mg Buffer to pH ca 5-8 Co-solvent 0-40 mg Flavour 0.01-1.0 mg Colourant 0.001-0.1 mg Suspending agent: e.g. xanthan gum, mycrocrystalline cellulose. Diluent: e.g. sorbitol solution, tipically water. Preservative: e.g. sodium benzoate. Buffer: e.g. citrate. Co-solvent: e.g. alcohol, propylene glycol, polyethylene glycol, cyclodextrin. 

1. A compound of formula (I):

wherein R₁ and R₂ represent independently a substituent selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl, or aroyl, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring; X represents an oxygen or sulphur atom; and n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.
 2. A compound of claim 1, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, aryl, or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring, which is a saturated or unsaturated optionally substituted monocyclic or bicyclic ring, which may contain further heteroatoms selected from O, N, or S, or C₂₋₇ alkenyl with 1 to 3 double bonds, or a mono-, bi- or tricyclic aryl optionally substituted with one or more C₁₋₆ alkoxy, trifluoro C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or an optionally substituted mono-, bi- or tricyclic cycloalkyl group, or aroyl group.
 3. A compound of claim 2, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, phenyl or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group or R₁ and R₂ together with the adjacent nitrogen atom form a hetero-monocyclic ring, which may be unsaturated or optionally saturated by C₁₋₆ alkyl or hydroxyl and which may contain further heteroatoms selected from O or N, or C₂₋₇ alkenyl with 1 double bond, or phenyl or naphthyl group optionally substituted with one or more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or cyclohexyl or adamantyl group, or benzoyl group.
 4. A compound of claim 3, wherein R₁ and R₂ represent independently hydrogen, a straight or branched C₁₋₆ alkyl optionally substituted with C₁₋₆ alkoxycarbonyl, or phenyl or R₁ and R₂ together with the adjacent nitrogen atom form a pyrrolidine, piperazine, piperidine or morpholine ring, which is optionally substituted by C₁₋₆ alkyl or a hydroxy group, allyl, phenyl optionally substituted with one or more C₁₋₆ alkoxy, cyano or C₁₋₆ alkanoyl, or cyclohexyl; X represents oxygen or sulphur; and n is
 1. 5. A compound selected from trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-methyl-urea, trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-propyl-urea, trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-isopropyl-urea, trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-hexahydro[1,4]diazepin-1-yl]-ethyl]-cyclohexyl}-3-ethyl-urea, trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-hexahydro[1,4]diazepin-1-yl]-ethyl]-cyclohexyl}-3,3-dimethyl-urea, trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-pyrrolidine-1-carboxamide, trans-N-{4-[2-[4-(2,3-dichlorophenyl)-hexahydro[1,4]diazepin-1-yl]-ethyl]-cyclohexyl}-pyrrolidine-1-carboxamide, trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3,3-diethyl-urea; trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-ethyl-3-methyl-urea; trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-methyl-3-propyl-urea; trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-urea; trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-piperazine-1-carboxamide; trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl-]cyclohexyl}-4-methyl-piperazine-1-carboxamide; trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-morpholine-4-carboxamide; trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-piperidine-1-carboxamide; trans-N-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-4-hydroxy-piperidine-1-carboxamide; trans-1-{-4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3,3-dimethyl-urea, trans-1-{4-[2-[4-(2,3-dichlorophenyl)-piperazin-1-yl]-ethyl]-cyclohexyl}-3-ethyl-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2-methoxy-phenyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(3-methoxy-phenyl)-urea, trans-1-allyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2,4-dimethoxy-phenyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2-ethoxy-phenyl)-urea, trans-1-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4-trifluoromethoxy-phenyl)-urea, trans-1-adamantan-1-yl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylyurea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl)-cyclohexyl}-3-(4-methylsulfanyl-phenyl)-urea, trans-1-biphenyl-2-yl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylyurea trans-2-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl)-cyclohexyl}-ureido]-3-methyl-butyric acid methyl ester, trans-2-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethylycyclohexyl}-ureido]-benzoic acid methyl ester, trans-1-(3-cyano-phenyl)-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}cyclohexyl)-3-(3,4,5-trimethoxy-phenyl)-urea, trans-1-cyclohexyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}cyclohexyl)-3-propyl-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}cyclohexyl)-3-phenyl-thiourea, trans-1-adamantan-1-yl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}cyclohexyl)-3-ethoxycarbonyl-thiourea, trans-1-tert-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-1-benzyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylythiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2-methoxy-phenyl)-thiourea, trans-1-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}cyclohexyl)-3-propyl-thiourea, trans-1-benzoyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thioureido]-acetic acid ethyl ester trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-ethyl-thiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenylypiperazin-1-yl]-ethyl}-cyclohexyl)-3-naphthalen-1-yl-thiourea, trans-1-tert-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-phenyl-urea, trans-1-benzyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylyurea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4-methoxy-phenyl)-urea, trans-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-ureido]-acetic acid ethyl ester, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2-methoxy-phenyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(3-methoxy-phenyl)-urea, trans-1-allyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2,4-dimethoxy-phenyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2-ethoxy-phenyl)-urea, trans-1-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4-trifluoromethoxy-phenyl)-urea, trans-1-adamantan-1-yl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylyurea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4-methylthio-phenyl)-urea, trans-1-biphenyl-2-yl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-2,3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-ureido]-3-methyl-butyric acid methyl ester, trans-2-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl]-cyclohexyl)-ureido}-benzoic acid methyl ester, trans-1-(3-cyano-phenyl)-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}cyclohexyl)-3-(3,4,5-trimethoxy-phenyl)-urea, trans-1-cyclohexyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-urea trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-phenyl-thiourea, trans-1-adamantan-1-yl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylythiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-ethoxycarbonyl-thiourea, trans-1-tert-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-1-benzyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylythiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(2-methoxy-phenyl)-thiourea, trans-1-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-propyl-thiourea, trans-1-benzoyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thiourea, trans-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-thioureido]-acetic acid ethyl ester, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-ethyl-thiourea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-naphthalen-1-yl-thiourea, trans-1-tert-butyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylyurea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-phenyl-urea, trans-1-benzyl-3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexylyurea, trans-1-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-3-(4-methoxy-phenyl)-urea, trans-[3-(4-{2-[4-(2,3-dichloro-phenyl)-piperazin-1-yl]-ethyl}-cyclohexyl)-ureido]acetic acid ethyl ester, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.
 6. A process for preparing a compound of formula (I):

wherein R₁ and R₂ represent independently a substituent selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl, aroyl, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring; X represents an oxygen or sulphur atom; and n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof, which comprises: a) forming an amide bond between a (thio)carbamoylchloride of formula (II):

wherein R₁, R₂ and X are as defined above for formula (I), and an amine of formula (III):

wherein n is as defined above for formula (I), or derivatives thereof, or b) forming an amide bond between the iso(thio)cyanate of formula (IV): R₁—N═C═X  (IV) wherein R₁ and X are as defined above for the formula (I), and an amine of formula (III):

wherein n is as defined above for the formula (I), or derivatives thereof, or c) transforming in situ an amine of formula (III) to an iso(thio)cyanate derivative and reacting the latter with an amine of formula (V):

wherein R₁ and R₂ are as described above for the formula (I), or derivatives thereof, and interconverting one compound (I) obtained by any of method a) to c), wherein R₁, R₂, X and n are as defined for compound (I) to a different compound of formula (I) wherein R₁, R₂, X and n are as defined for compound (I); where appropriate, separating the enantiomers and/or diastereomers, and/or cis- and/or trans-isomers of compounds of formula (I), or intermediates thereto wherein R₁, R₂, X and n are as defined for compound (I) by conventional methods; and optionally thereafter forming salts and/or hydrates and/or solvates.
 7. The process of claim 6, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, aryl, or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring, which is a saturated or unsaturated optionally substituted monocyclic or bicyclic ring, which may contain further heteroatoms selected from O, N, or S, or C₂₋₇ alkenyl with 1 to 3 double bond, or a mono-, bi- or tricyclic aryl optionally substituted with one or more C₁₋₆ alkoxy, trifluoro C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or an optionally substituted mono-, bi- or tricyclic cycloalkyl group, or aroyl group.
 8. The process of claim 7, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, phenyl or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group or R₁ and R₂ may form a heterocyclic ring with the adjacent nitrogen atom, which may be unsaturated or saturated optionally by C₁₋₆ alkyl or hydroxy substituted monocyclic ring, which may contain further heteroatoms selected from O or N, or C₂₋₇ alkenyl with 1 double bond, or phenyl or naphthyl group optionally substituted with one or more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or cyclohexyl or adamantyl group, or benzoyl group.
 9. The process of claim 8, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with C₁₋₆ alkoxycarbonyl, or phenyl or R₁ and R₂ form with the adjacent nitrogen atom an optionally by C₁₋₆ alkyl or hydroxy substituted pyrrolidine, piperazine, piperidine or morpholine ring, allyl, phenyl optionally substituted with one or more C₁₋₆ alkoxy, cyano or C₁₋₆ alkanoyl, cyclohexyl; X represents oxygen or sulphur; and n is
 1. 10. An amine of formula (III):

wherein n is 2, and/or protected forms thereof and/or geometric isomers and/or stereoisomers and/or diastereomers and/or salts and/or hydrates and/or solvates thereof.
 11. A pharmaceutical composition comprising a compound of formula (I)

wherein R₁ and R₂ represent independently a substituent selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl, or aroyl, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring; X represents an oxygen or sulphur atom; and n is an integer of from 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof and one or more physiologically acceptable carriers therefore.
 12. The pharmaceutical composition of claim 11, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, aryl, or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring, which is a saturated or unsaturated optionally substituted monocyclic or bicyclic ring, which may contain further heteroatoms selected from O, N, or S, or C₂₋₇ alkenyl with 1 to 3 double bond, or a mono-, bi- or tricyclic aryl optionally substituted with one or more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or an optionally substituted mono-, bi- or tricyclic cycloalkyl group, or aroyl group.
 13. The pharmaceutical composition of claim 12, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, phenyl or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group or R₁ and R₂ together with the adjacent nitrogen atom form a hetero-monocyclic ring, which may be unsaturated or optionally saturated by C₁₋₆ alkyl or hydroxyl and which may contain further heteroatoms selected from O or N, or C₂₋₇ alkenyl with 1 double bond, or phenyl or naphthyl group optionally substituted with one or more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or cyclohexyl or adamantyl group, or benzoyl group.
 14. The pharmaceutical composition of claim 13, wherein R₁ and R₂ represent independently hydrogen, a straight or branched C₁₋₆ alkyl optionally substituted with C₁₋₆ alkoxycarbonyl, or phenyl or R₁ and R₂ together with the adjacent nitrogen atom form a pyrrolidine, piperazine, piperidine or morpholine ring, which is optionally substituted by C₁₋₆ alkyl or a hydroxy group, allyl, phenyl optionally substituted with one or more C₁₋₆ alkoxy, cyano or C₁₋₆ alkanoyl, or cyclohexyl; X represents oxygen or sulphur; and n is
 1. 15. A method of treating and/or preventing a condition which requires modulation of dopamine receptor(s) which comprises administering to a subject in need thereof an effective amount of a compound of formula (I)

wherein R₁ and R₂ represent independently a substituent selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl, aroyl, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring; X represents an oxygen or sulphur atom; and n is an integer of 1 to 2, and/or geometric isomers and/or stereoisomers and/or diastereomers and/or physiologically acceptable salts and/or hydrates and/or solvates thereof.
 16. The method of claim 15, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, aryl, or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group, or R₁ and R₂ together with the adjacent nitrogen atom form a heterocyclic ring, which is a saturated or unsaturated optionally substituted monocyclic or bicyclic ring, which may contain further heteroatoms selected from O, N, or S, or C₂₋₇ alkenyl with 1 to 3 double bond, or a mono-, bi- or tricyclic aryl optionally substituted with one or more C₁₋₆ alkoxy, trifluoro C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or an optionally substituted mono-, bi- or tricyclic cycloalkyl group, or aroyl group.
 17. The method of claim 16, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with one or more C₁₋₆ alkoxycarbonyl, phenyl or (C₁₋₆ alkoxycarbonyl)-C₁₋₆ alkyl group or R₁ and R₂ together with the adjacent nitrogen atom form a hetero-monocyclic ring, which may be unsaturated or optionally saturated by C₁₋₆ alkyl or hydroxyl and which may contain further heteroatoms selected from O or N, or C₂₋₇ alkenyl with 1 double bond, or phenyl or naphthyl group optionally substituted with one or more C₁₋₆ alkoxy, trifluoro-C₁₋₆ alkoxy, C₁₋₆ alkoxycarbonyl, C₁₋₆ alkanoyl, aryl, C₁₋₆ alkylthio, halogen or cyano, or cyclohexyl or adamantyl group, or benzoyl group.
 18. The method of claim 17, wherein R₁ and R₂ represent independently hydrogen, or a straight or branched C₁₋₆ alkyl optionally substituted with C₁₋₆ alkoxycarbonyl, or phenyl or R₁ and R₂ together with the adjacent nitrogen atom form a pyrrolidine, piperazine, piperidine or morpholine ring, which is optionally substituted by C₁₋₆ alkyl or a hydroxy group, allyl, phenyl optionally substituted with one or more C₁₋₆ alkoxy, cyano or C₁₋₆ alkanoyl, or cyclohexyl, X represents oxygen or sulphur, and n is
 1. 19. The method of any of claims 15 to 18, wherein the dopamine receptor is a dopamine D₃ and/or D₂ receptor. 